Cam milling attachment for milling machines



4 Sheets-Sheet 1 May 15, 1956 w. F. SAWYER CAM MILLING ATTACHMENT FOR MILLING MACHINES Filed Jan. 14, 1953 3f JU l/ s 1 0 m Y 9 J ma; ....mm/\ a I 6 m/ M w 7 `J um f A Il 1 Y 00a, @Na 401W w, 9% W, 7 a, I M w o fw www e o Ae 7 J ATTORNEYS May 15, 1956 w. F. SAWYER 2,745,319

CAM MILLING ATTACHMENT FOR MILLING MACHINES Filed Jan. 14, 1955 4 Sheets-Sheet 2 IIV Q3 m\\\ \yk\\\\\\\x\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\w 619 71 IN VENTOR.

ATTDRNEYS May 15, w56 w. F. SAWYER 2,745,319

CAM MILLING AIIACMMENT FOR MILLING MACHINES Filed Jan. 14, 1955 4 Sheets-Shee 5 J3 57 5W y .96 107 107 6 95 ZI 10084 9 gg ATTORNEYS May 15, w56 W. F. SAWYER 2,745,39

CAM MILLING ATTACHMENT FOR MILLING MACHINES Filed Jan. 14, 1955 4 Sheets-Sheet 4 ATTE] RN EYS United States Patent CAM MILLING ATTACHMENT non MrLLrNG MAcmNns a William F. Sawyer, Brighton, Mich.

Application January 14, 1953, Serial No. 331,276 'Y 3 Claims. (Cl. 90-13.9)

This invention relates to cam cutting and milling jigs and tools, and in particular a cam milling attachment adapted to be used on plain or universal milling machines whereby a true, uniform lead may be milled on cams on the at or Brown and Sharp type.

The purpose of this invention is to provide mechanical means in a cam cutting or milling attachment whereby a blank mounted on a spindle having a master cam Vor template thereon may be actuated in relation to a cutter to correspond with a knob, aligned vwith the cutter'and following the template whereby a cam maybe milled with precision. 1 e

It is difficult to duplicate cams because with the conventional type of tool or work holder there is not sutlicient flexibility of travel between the cutting tool and material from which the cam is cut to accurately follow an uneven surface and to adjust the parts for a precision job requires the services of an expert. Furthermore, in the conventional method of milling a cam a layout of the cam surface is required on the blank from whichlthe cam is cut and for precision work this also requires the services of an expert.

With this thought in mind this invention contemplates a cam milling attachment comprising aspindle journaled on a slide with the travel of the slide controlled by a follower on 'a sine bar and with the spindle rotated by a hand wheel whereby a master cam or template is adapted to be actuated with the cam service following a stationary knob aligned with a cutter and mounted on a machine on which the attachment is positioned.

The object of this invention is to provide an attachment for milling machines wherein a blank is actuated to cutting position in relation to a milling ,cutter to correspond with a master cam or template through mechanically operated elements.

Another object of the invention is to provide means for cutting a cam with a milling cutter whereby a layout on the blank from which the cam is to be cut is not necessary.

A further object of the invention is to provide a cam milling attachment for millingl machines with which cams of odd shapes may be cut with accuracy in lwhichthe .at-y tachment is of a simple and economical construction.

With these and other objects and advantages in view the invention embodies a horizontal disposed yslide positioned to travel in a plane perpendicular to the axis of a cutter of a milling machine, a sine bar pivotally mounted von the machine bed and having a follower thereon which is pivotally connected to the slide, providing means for adjusting the position of the sine bar, a spindle journaled on the slide and having means for mounting a blank on one end and a master cam or template on the other, and a hand wheel actuated gear assembly for, simultaneously, actuating the slide and rotating the spindle.

Other features land advantages of the invention will appear for the following description taken in connection with the drawings, wherein:

Figure l is a plan view of the attachment showing the ICC device on a milling machine bed with parts of the vdevice broken away and other parts shown in sections. v

Figure 2 is a vertical section taken on line 2--2 o Figure lshowing the worm gears for rotating the spindle and the adjusting screw for setting the cam bar.

Figure 3 is the front elevational view of the attachment showing a point and a scale disc on which hundreds and egreesare provided and illustrating a template positioned on the end of the spindle. s. Figure 4 is a longitudinal section through the slide taken substantially on line 4 4v of Figure-1 also showing the sine bar and follower. v

Figure 5 is the cross section through the s lidetaken on line 5-5 of Figure l illustrating the mounting of the spindle.

Figure -`6 is a section taken substantiallyon line 6--6 of Figure l illustrating the gear assembly for actuating the slide and spindle at different proportionate speeds. s Figure 7 is a sectional plan taken on line l7-7,of Figure 3 illustrating the train of gears with the means for selectively connecting the gears to the cam'wheel and also showing the bevel gears for lrotating thesplindle through the worm. v .i e Y Figure 8 is a plan View or' the lower partof the slide showing the sine bar with the clamping means, adjust; ing screwand gage block with which th'e sine bar is ad,- justably mounted on the bed on the milling machine.V Figure 9 is a View looking upwardly toward the'kunder side of the slide of the attachment. Figure l) is a detail showing a section through the graduated scale mounting with which the vsine bar is set to adjusted positions. r Figure ll is a detail showing a section taken Online v11-11 of Figure l showing the pivotal mounting of ythe since bar t0 the mounting plate.

Figure l2 is a detail showing a section taken von line 12--12 of Figure l illustrating the mounting ofthe-sine; bar adjusting screw. l .1, ,lv

Figure 13 is a detail illustrating an arrangement of bevel gears for actuating the worm gears of the spindle mounting showing an operating gear thereof in the neutral position. j L.

Figure 14 is a detail illustrating ditfere'ntf'positions of an adjustable handle for operating the bevel gears.l s ,t Figure l5 is a detail similar to that shown inrFigure` 13 showing the cam positioned to hold a gear 'on one sideof the assembly away from the driving gear. Y Figure 16 is a similar detail showingthe gear on the opposite side of the assembly heldk away from gear.

Referring now to the drawings whereinnlike refcre Cf,

characters denote corresponding parts. the improvedcan slide l0, a spindle 11 journaled on the slide, a handwheel 12 mounted on a hand wheel shaft 13 for rotatingithe spindle through bevel gears 14, 15 and 16 witha worin 17 and a worm gear 1S, a sine bar 19 having a follower 2li thereon, a threaded rod 21 extended throughthe lfol-y lower and actuated from the shaft 13 throughay gearfassembly, an adjusting screw 22 for adjusting the'y position of the sine bar, and a graduated scale 23V for settingthe sinebar. fi?

The slide 10 is provided with a dovetail slot 24 Vin the under surface which receives a tongue 27S of a base 2 ,6 and, as shown in Figures 4 and 5, the base is provided with anelongated opening 27 in which a spring 28 is positioned. One end of the spring is positioned vin av socket theV driving afterra cutter33 has milled a slot or dwell in a cam, as

' indicated by the No. 34.

The spindle 11 on which the blank 34 is carried is moved toward the cutter 33 by the hand wheel 12 through y the action of the follower sliding on the sine bar 19 and with the follower moving toward the pivot 35 of the sine `bar the spindle moves toward the cutter and with the follower moving away from the pivot the spindle and blank 34 move awayV from thecutter. n

The follower'20 is actuated by the threaded rod 21 which is threaded in a traveling block 36 slidably mounted in a'slot 37 in the slide 10. The block 36 is provided with a recess 38 in which a pin 39 on the follower 20 is' positioned. K Y

One end ofthe rod 21- is provided with a pin 40 that is threaded in a bearing 41 in a plate 42 that is secured to one Vend ofptheslide 10 with bolts 43 and the opposite end of the rod is journaled in a bearing 44 at the front of the slide. The end 45 of the rod, whichextends through the bearing, 44 is provided with gearsV 46, 47 and 48 that mesh with gears 49, 50 and 51 on the shaft 13 onl which the hand wheel 12 is mounted. By this means the hand wheel rotates the rod'21, selectively, at diterent Y speeds through ythe gear assembly.

having a ange 54 and the angeris provided withV an opening 55 intorwhich the inner end ,of the pin 52 extends when it is desired to engage the hand wheel with the gear 51.`

The gear 50 is mounted on a sleeve 56 also having a ange 57 on one end and the flange is provided with an opening 58 that is positioned to receive the pin 52. The gear 49 is provided with an annular rim 59 in which an opening 60 is provided for receiving the pin 52.

v'The pin 52 is' resiliently held inwardly by a spring 61 in a casing or cup 62, the inner end of the spring bearing against the collar 63 carried by the pin 52. i

The cup 62 in which the pin 52 is mounted is carried by`a spring arm 64 that is pivotally mounted on a pin 65,

as shown in `Figure 3 and by thisV means the pin 52 is adapted to be insertedthrough openings 66, 67 and 68 tocorrespond with thefopenings 55, 58'and 60 of the anges of the gears 51 and 50Vand the rim of the gear 49.

The sine bar 19 is pivotally mounted by the pin 35 on the' section 69 of ythe base 26 and the sine bar is actuated by the `adjusting screw 22 which is mounted in a bearingl 70 on the baise with a screw 71, as shown in Figure 12, and the screw is actuated by a knob or head 72 at one side of the bearing. collar 73 on theopposite side of the bearing and,

`as shown in Figure 2, the screw extends through a block 74t rthat is secured Vto the end of the sine bar 19 with a screw 75l The sine bark 19 is also provided with the arcuate arm 23 havingaV slot 77 therein and a bolt 78 extended through the slot 77 and threaded into an opening 79 in the section 69. of the slideprovides means for clamping. thesine bar in adjusted positions. One edge of the arcuate 'arm 23 is provided with graduations 76 to facili-l tate threading the sine bar to different degrees.

By this means the sine bar is set whereby upon longitudinalmovement of the slide on the bed of the machine the follower slides on the sine bar thereby controlling the movement of the slide.

To further facilitate accurately positioning the sine bar 19 a gage block 80 is provided and with the gage block positioned against a stop 81 secured to the section69 of thel slide by screws 82 a stud S3, which is threaded in one sidey of the sine bar engages 4the end of the gage block to definitely locate the sine bar and follower.

The spindle 11 is journaled by bearings S4 and 85 in a substantially U-shape section 86 of the slide 10 and, as illustrated in FigurevS, the worm gear 18, which is The screw is held by a actuated pin 52. `The gear 51 is mounted on a sleeveV 53,V

positioned in a gear housing 87 at one end of the seetion 86 of the slide, is locked against the shoulder. 88 of Ithe spindle with a lock nut 89 that is threaded on a section 90 of the spindle. The diameter of the section 90 of the spindle is less than that of the body of the spindle and from the section 90, a section 91 of a still smaller diameter extends Vfrom `the end of the spindle rthrough a wall 92 of the -gear housing 87. The extended end 93 of the spindle on which a lock nut 94 is threaded extends through the Vwall 92 and a graduated.

The spindle 11 is also providedwith a threaded section 98 on which lock nuts 99 are threaded.

The opposite end 100 of the spindle'11 is provided with a threaded socket 101 intovwhich a bolt 102 extends and, as illustrated in Figure 5, a blank 34from which it is desired to cut a cam is positioned between lock'washers 103 and 104, the washer 104 having a re'- cess which extends over an extended portion 105 of, a section 106 at the end of the spindle. The section 106 is provided with a pin 107 that extends through the washer 104 and into the blank 34 to position the blank, and also to retain the blank in a fixed position as it is Vbeing milled to form a cam.

By this means the blank 34 isvr positioned tocoact with a cutter, as indicated by the numeral 33, and which is journaled in and rotated by a milling machine, as in dicatedv by the numeral 10S. The milling machine is also provided with a bed 109 upon which the base 26 is positioned. Y

' The spindle 11 is rotated by the hand wheel 12 through the gear assembly with the worm gear 1S, xedly mounted on the spindle rotated by the worm 17 on a stub shaft 110, which is journaled in bearings 111 and 112 of a Vsection 113 of a gear housing and, as illustrated in Figures/2 and 7, the bevel gear 16 is mounted on the lower end of -the stub shaft 110. The end sections of the hub of the worm 17 position the worm between the Y arm 116 which is provided with a spring actuated pin 117 that is positioned to extend into openings 118 in the section 113 of the gear housing,.and by turning the arm 116 with the spring pin 117 withdrawn the cam 114 may be adjusted whereby both of the gears 14 and 15 are spacedfrom the gear 16, as shown in Figure 13, whereby the gear 14 is spaced from the gear 16 and the gear 15 is in mesh with the gear 16, las shown in Figure l5, or whereby the gear 15 is spaced from the gear 16 and the gear 14 is in mesh with the gear 16 as shown in Figure 16.

By this means the bevel gears are adapted to be set toy a neutral position whereby the slide may be actuated without rotating the spindle of the cam and also to positions whereby the direction of travel of the slide may be reversed.

The bevel gears 14 and 15 are slidably mounted on the shaft 13, as illustrated in Figure 7 and these gears are urged into meshing relation with the gear 16 by springs 119 and 120, which bear against inner surfaces of4 side walls 121 and 122 of the section 113 of the gear housing, andV against the hubs of the gears, whereby the gears are resiliently held against the face of the cam 114. The side walls 121 and 122 are provided with bearings123 and 124, respectively by which the shaft 13 is journaled in the hous- Y The base 26 upon which the slide 10 is mounted is posi- 'tioned on the bed of a machine with the ends held by clamps 125 and 126 having screws 127 and 128 therein, as illustrated in Figure l, and with the parts in position the attachment is mounted whereby the stationary knob 129 on an arm 139 engages the surface of a template, as indicated by the numeral 96 and whereby a blank 34 is positioned to be engaged by a cutter 33.

With the parts as disclosed and described the spindle is actuated by the hand wheel 12. so that the surface of the cam 96 shdes against the knob 129 and in this movement a similar Surface is cut by the cutter 35 on the blank 34.

The travel of the slide is controlled by the gear assembly and by adjusting the position of the pin 52. The follower 20 is moved in proportion to the rotation of the spindle whereby the travel of the slide l@ is in proportion to the rotation of the spindle.

By adjusting the angle of the sine bar 19 and the proportionate speed of the spindle and slide it is possible to cut arcuate or dat surfaces on the cam and, therefore, it is possible to cut a cam to the exact form of a template.

It will be understood that modifications, within the scope of the appended claims, may be made in the design and arrangement of the parts without departing from the spirit of the invention.

`What is claimed is:

l. In a cam cutting attachment for a milling machine, the combination which comprises a base having a longitudinally disposed dove-tail groove in the under surface, said groove being adapted to receive a tongue of a conventional milling machine bed, a horizontally disposed cam carrying spindle rotatably mounted in said base, means for clamping a pattern on one end of the spindle, means for clamping a blank on the end of the spindle opposite to the end on which the pattern is positioned, said spindle positioning the blank in cutting relation to a milling cutter of a machine, a hand wheel shaft positioned parallel to and spaced from the spindle, said hand wheel shaft being rotatably mounted on said base, a hand wheel on the hand wheel shaft, a stub shaft extended from the hand wheel shaft to a point above the spindle, a worm gear on the spindle, a worm on the stub shaft positioned in meshing relation with the worm gear of the spindle, and means for advancing the base whereby the cam blank follows the outline of the pattern upon rotation of the spindle by the hand wheel.

2. In a cam cutting attachment for a milling machine, the combination which comprises a base having a longitudinally disposed dove tail groove in the under surface, said groove being adapted to receive a tongue of a conventional milling machine bed, a horizontally disposed cam carrying spindle rotatably mounted in said base, means for clamping a pattern on one end of the spindle, means for clamping a blank on the end of the spindle opposite to the end on which the pattern is positioned, said spindle positioning the blank in cutting relation to a milling cutter of the machine, a hand wheel shaft positioned parallel to and spaced from the spindle, said hand wheel shaft being rotatably mounted in said base, a hand wheel on the hand wheel shaft, a stub shaft extended from the hand wheel shaft to a point above the spindle, a worm gear on the spindle, a worm on the stub shaft positioned in meshing relation with the worm gear of the spindle, a sine bar pivotally mounted on the bed of the machine, means for adjusting the angular relation of the sine bar to the base, and a follower carried by the base and slidably mounted on the sine bar for advancing the base whereby the cam blank follows the outline of the pattern upon rotation of the spindle.

3. 1n a cam cutting attachment for a milling machine, the combination which comprises a base having a longitudinally disposed dove tail groove in the under surface, said groove being adapted to receive a tongue of a conventional milling machine bed, a horizontally disposed cam carrying spindle rotatably mounted in said base, means for clamping a pattern on one end of the spindle, means for clamping a blank on the end of the spindle opposite to the end on which the pattern is positioned, said spindle positioning the blank in cutting relation to a milling cutter of the machine, a hand wheel shaft positioned parallel to and spaced from the spindle, said hand wheel shaft being rotatably mounted on said base, a hand wheel on the hand wheel shaft, a stub shaft extended from the hand wheel shaft to a point above the spindle, a worm gear on the spindle, a worm on the stub shaft positioned in meshing relation with the worm gear of the spindle, a sine bar adapted to be pivotally mounted on the bed of the machine, an adjusting screw for moving one end of the sine bar in relation to the base, a follower slidably mounted on the sine bar, a screw rotatably mounted in the base and extended through said follower, a train of gears mounted on the screw and hand wheel shaft for rotating the screw at different speeds in relation to the speed of the spindle, and a graduated wheel extending from one side of the sine bar to facilitate setting the sine bar in diierent positions.

References Cited in the le of this patent UNITED STATES PATENTS 1,689,370 Tessky Oct. 30, 1928 1,770,498 Spatenga July l5, 1930 2,386,973 Mieth Oct. 16, 1945 2,471,493 Norton May 3l, 1949 2,507,547 Shephard May 16, 1950 2,534,231 Christian et al Dec. 19, 1950 FOREIGN PATENTS 536,272 France Apr. 29, 1922 

